<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>
    <script type="text/babel">
        class Parent extends React.Component {
            state = {
                car: "五菱宏光"
            }
            render() {
                const {car} = this.state
                return (
                    <div>
                        <h1>我是父组件</h1>
                        <p>我开的车是{car}</p>
                        <button onClick={this.changeCarHandle}>股票涨停了,换一辆车</button>
                        <hr />
                        <Child a={1} car={car} />
                    </div>
                )
            }
            changeCarHandle = () => {
                this.setState({ car: "奥迪RS7" })
            }
        }

        class Child extends React.Component {
            
            render() {
                // this.props.car = "宝马mini"//报错,props是只读属性Cannot assign to read only property 'car' of object '#<Object>'
                // const {car} = this.props//解构出来然后重新赋值
                let {car} = this.props
                car += "粉色的"
                return (
                    <p>我是儿子组件,我开我老子的车{car + "!!!!!"}</p>
                )
            }
        }

        const root = ReactDOM.createRoot(document.getElementById('app'));
        root.render(<Parent />)

    </script>

</body>

</html>